Electrical units and standards
Kibble, Bryan P. Formerly, Division of Electrical Science, National Physical Laboratory, Teddington, Middlesex, United Kingdom.
Bailey, A. Earle Formerly, Electrical Science Division, National Physical Laboratory, London, United Kingdom.
Last reviewed:January 2020
- Electrical and Magnetic Units
- The cgs system
- International units
- The mksa units
- SI units
- Determinations of Electrical Units from their SI Definitions
- Calculable capacitor
- Watt balance
- Josephson effect
- Quantum Hall effect
- Results of 1990 change in standards
- International comparisons
- International Agreement
- Adoption of values for volt and ohm standards
- Proposed changes to the SI units
- Related Primary Literature
- Additional Reading
The process of measurement consists in finding out how many times the quantity to be measured contains a fixed quantity of the same kind, called a unit. The definitions of the units often involve complex physical theory and do not lend themselves readily to practical realization. The concrete representations of units are known as measurement standards. In practice, measurements are made by using an instrument calibrated against a local reference standard, which itself has been calibrated either directly or by several links in a traceability chain against the national standard held by the national standards laboratory.
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